Printer Monocolor: Void Areas, White Spots - Konica Minolta bizhub C250 Service Manual

Field Service Ver. 3.0 Aug. 2006
18.3.21

Printer Monocolor: void areas, white spots

A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section
Image Check
1
2
Imaging Unit
3
4
Toner Cartridge
5
Installation environ-
ment
6
Void areas
4036fs4050c0
Check Item
There are void areas at the front
side or high density section.
There is void area at the rear side
section.
The surface of the PC Drum is
scratched.
Dirty on the outside.
Foreign matter or caked toner in
the Toner Cartridge.
Is the atmospheric pressure at the
installation site low?
18. Image quality problem
White spots
4036fs4051c0
Result
YES P.494
YES Perform [Transfer Adjust]
of [Image Process Adjust-
ment] under Service
Mode.
YES Change Imaging Unit.
YES Clean.
YES Remove foreign matter.
YES Make the following adjust-
ment: [Service Mode] →
[Image Process Adjust-
ment] → [Dev. Bias
Choice].
Action
499